So I'm pretty sure the factory usb port is 1amp. When I run Google maps I fail to gain a positive charge on my galaxy s7. I plugged a 2amp charger into the 12v port and ran a USB cable down there. Problem is my phone mount is located on top the dash so I have a USB cable running from theach dash down to the floor console. Ideally I would like a short cable running from the factory usb port to myou phone mount. Do any of the other mercedes models come standard with a 2 amp port? Maybe just a simple swap?